Controlling the treatment of fibrous material

Abstract

A method for controlling a device for treating a fibrous material includes the steps of: providing that the device includes a housing in which at least a first treatment tool and a second treatment tool are arranged; mounting at least one of the first base plate and the second base plate in an axially movable manner in order to compensate for a wear of the first treatment profile and the second treatment profile; measuring a distance between the first base plate and the second base plate respectively of the first treatment tool and the second treatment tool of a treatment nip during an operation of the device; and selecting a value of a total power depending on the distance between the first base plate and the second base plate of the at least one treatment nip.

What is claimed is: 
     
         1 . A method for controlling a device for treating a fibrous material, the method comprising the steps of:
 providing that the device includes a housing in which at least a first treatment tool and a second treatment tool are arranged, the first treatment tool and the second treatment tool:
 being mounted on a first base plate and a second base plate respectively; 
 having a rotationally symmetrical shape; 
 being arranged coaxially relative to each other in that the first treatment tool and the second treatment tool rotate relative to one another about a common axis; 
 delimiting at least one treatment nip through which the fibrous material flows; and 
 having respectively a first treatment profile and a second treatment profile facing toward the at least one treatment nip; 
   mounting at least one of the first base plate and the second base plate respectively of at least one of the first treatment tool and the second treatment tool in an axially movable manner in order to compensate for a wear of the first treatment profile and the second treatment profile;   measuring a distance between the first base plate and the second base plate respectively of the first treatment tool and the second treatment tool of the at least one treatment nip during an operation of the device; and   selecting a value of a total power depending on the distance between the first base plate and the second base plate of the at least one treatment nip.   
     
     
         2 . The method according to  claim 1 , wherein the value of the total power is selected depending solely on the distance between the first base plate and the second base plate of the at least one treatment nip. 
     
     
         3 . The method according to  claim 1 , wherein the value of the total power is selected in conjunction with a plurality of additional values, depending on the distance between the first base plate and the second base plate of the at least one treatment nip. 
     
     
         4 . The method according to  claim 1 , wherein the value of the total power is adjusted at least when a change in the distance between the first base plate and the second base plate of the at least one treatment nip of at least 1 mm is detected. 
     
     
         5 . The method according to  claim 1 , wherein the value of the total power is adjusted at a plurality of predetermined time intervals, which is at least every 1 to 2 weeks, depending on the distance between the first base plate and the second base plate of the at least one treatment nip. 
     
     
         6 . The method according to  claim 1 , wherein, after replacing at least one of the first treatment tool and the second treatment tool, a no-load power is measured and is stored in a memory as a starting value for a control system. 
     
     
         7 . The method according to  claim 6 , wherein, for a desired treatment intensity, a relevant specific power of the device, which results from a difference between the total power and the no-load power, is kept constant over an operating period, taking into account a changing no-load power. 
     
     
         8 . The method according to  claim 1 , wherein, after replacing at least one of the first treatment tool and the second treatment tool, a no-load power is measured – when the at least one treatment nip is closed – and is stored in a memory as a starting value for a control system. 
     
     
         9 . The method according to  claim 1 , wherein, in determining the value of the total power depending on the distance between the first base plate and the second base plate of the at least one treatment nip, a plurality of values are accessed. 
     
     
         10 . The method according to  claim 9 , wherein the plurality of values are a plurality of characteristic diagrams stored in a memory of a controller. 
     
     
         11 . The method according to  claim 1 , wherein the method is used in a refiner. 
     
     
         12 . The method according to  claim 11 , wherein the refiner is an LC refiner. 
     
     
         13 . A device for treating a fibrous material, the device comprising:
 a first base plate;   a second base plate;   a first treatment tool;   a second treatment tool;   a housing in which at least the first treatment tool and the second treatment tool are arranged, the first treatment tool and the second treatment tool:
 being mounted on a first base plate and a second base plate respectively; 
 having a rotationally symmetrical shape; 
 being arranged coaxially relative to each other; 
 rotating relative to one another about a common axi; 
 delimiting at least one treatment nip through which the fibrous material flows; and having respectively a first treatment profile and a second treatment profile facing toward the at least one treatment nip, at least one of the first base plate and the second base plate respectively of at least one of the first treatment tool and the second treatment tool being mounted in an axially movable manner in order to compensate for a wear of the first treatment profile and the second treatment profile; 
 a sensor configured for determining a position of an axially movable one of at least one of the first treatment tool and the second treatment tool; and 
 a memory, in which a characteristic diagram is stored, the characteristic diagram containing a dependency of a no-load power depending on a change in a distance between the first treatment tool and the second treatment tool. 
   
     
     
         14 . The device according to  claim 13 , wherein the device includes a wear indicator configured for treating the first treatment tool and the second treatment tool, wherein the device is configured for triggering a signal when a value associated with the signal falls below a predetermined distance value or a predetermined distance change.